Glass pressing machine



Aug.l9, l94l, A F v 2,253,276

GLASS PRESS I'NG MACHINE Filed Aug. so, 1938 :5 she ts-sheet} Emu/Mimi 1 1941- I 'r. H. JEFFERS 2,253,276

GLASS PRESS ING MAGHINE Filed Aug. 30, 1938 3 SheetsShee't 2 3 Sheets-heet 3 T. H. J'EFFERS GLASS PRESSING MACHINE- Filed Aug. 30,- 1938 J WP. Z J w ofrigureop Patented Aug. 19,1941

.UNlTED STATES PATENT OFFICE sesame schism. (01. 49-31) This invention relates to a glass pressing machine, and more particularly to an automatic machine for forming pressed articles of glassware, such as water tumblers or the like.

The principal object of my invention is to provide a rapid and eflicient automatic machine for forming pressed articles of glassware.

, A further object of my invention is to provide two series of complemetary mold members are supported on two movable endless carriers which are relatively movable toward and away from each other to successively move the complementary mold members into and out of molding position. 7

Other objects and advantages of the invention will become apparent during the course of the following description.

V. of Figure 1,

Figure '6 is an enlarged detail view of a of complementary mold members,

Figure 7 is an enlarged vertical sectional view of the compressed air distributing valve, and,

Figure 8 is a cross-section taken on line 8-.

Referring to drawings, the numeral l designates aj'pair of spaced parallel channel'members constituting the main frame of the machine. These channel members are carried by and legs II. An endless linkbelt l2 arranged between the ehannelmembers llaroundapairof sprocket members ll on shafts ll. rotatably supported II secured tothe 1 channel members It adjacent the ends thereof.

Thelink belt i2 carriesa plurality of female mold members designated generally by the numeral l8. Referring particularly to figures 6 and 8, each of the female mold members I! comprises complementary portions I1 and i2 hinged togetherbymeansofapairoflugs liseeuredto meet the complementary members'and a pair of lugsffl" secured to the other complementary member, the lugs being provided an automatic glass pressingmachine in which ing openings to receive a hinge pin 2|, the lower end of which is secured to a plate 22 which serves as a support for the mold member ii. The hinge pin 2i is held in vertical position by'meansof a boss 23 connected by the bracket 2lto the sup-- portingplate 22.. The complementary portionshaving openings 21 an'd 28 to receive pins 29 and 3. which serve as connecting pins for adjacent links of the link belt I2. Each of'the pins 10 is elongated to extend substantially beyond the edges of theplate 22 for a purpose to be described.

The link belt I2 is moved in a clockwise direction, in a manner to be described. During the movement of one of the molds it from a position adjacent the right end of the frame III, as viewed in Figure 1, to a position adjacent the left end of the frame II, the mold-simporting plates 22 are carried solely by the link belt l2. However, during the movement of a mold member I! from a position adjacent the left end of the frame ill to a position adjacent the right end of the frame ll,'each supporting plate 22 is carried inrigid guide members which accurately position the supconsistef a pair ofrails 2i famed by-the upper "of, the It. The 1111-- of each of the 2i is outasat II'Hto provide horizontal faces forsupporting portions of the plate 22, and with vertical faces adapted to bear against the vertical facesofthe. plate .22 at the sides thereof to prevent transverse movement of the plates 22. Another pairof rails 32 are arrangedabovetherailslLtheinnerendsofwhich overlietheedge'portions of the plate 22 atthe' sides thereof. As will be apparent, the arrangement of the rails 2i and 23 provides a'groove to As heretofore described, the

receive the edge portions of the plates 22 at the sides thereof.

V complementary sections ofthe female mold members it are adaptedtobeswimgtowardandawayfromeach other into elem and opened positions, respee-" tively. In order to maintain the molds in closed with register-' positiondurlngtheirmovementontheupperrun of the link belt 12, I provide positive means for bearing against the sides of the molds l6. means consists of a pair of rails 34, the inner edges of which are spaced apart the diameter of the molds IS. The rails 34 are bent downwardly and outwardly, the outwardly extending portion 35 being arranged on the rail 33. The outwardly Such extending portions :5 of the rails 34, the rails 33 and the rails 3| are all secured to the upper flmges 32' of the frame I0 by means of bolts 36. As shown in Figure 5,'the rails 34 are flared outwardly adjacent the left end of the machine as which is rotated by the main drive shaft 43 from any suitable source of power (not shown). crank pin 44 is secured to the outer face of each of the crank wheels 31 adjacent the periphery thereof. A pair of connecting rods 45 are pivotally secured to the crank pins 44 and, at the opposite ends ofthe connecting rods, to pins 46 carried by cross heads 41.

Each of the crossheads 41 consists of a metal block having a T-shaped groove machined in-the upper portion thereof to receive the similarly shaped lower portion of rails 48 secured to the lower flanges 49 of the channel members I8. The rails 48 support 'the crossheads 41 during the reciprocation of the crossheads by means of the connecting rods 45 during rotation of the crank wheels 31. Each of the crossheads 41 is provided on its forward face with a pair of ears 58 which pivotally support the upper end of a depending lever arm 5| by means of a pin 52 passing through openings in the ears 58 and the lever arm 5|. -At a point below the ears 58,-each of the crossheads is provided with a stop 53, the outer face of which bears against the inner edge of the lever arm 5| intermediate its length when the latter is depending in vertical position from the pin 52. The lower ends of the lever arms 5| are below the horizontal plane passing through the axis of the pins 30 in the lower run of the link belt I! and are arranged in the path of the outwardly extended portions of the pins 38 so as to bear against such pins when the crosshead is moved from right to left, as viewed in Figure 1. While the stops 53 limit the counterclockwise movement of the arms 5| beyond the position shown in Figure 1, the lever arms 5| are adapted to be moved freely in a clockwise direction, as a result of which the lower ends of the lever arms 5| swing in a clockwise direction and pass over the outwardly extended portions of the pins 38 during the movement of the crossheads 41 from on'four upright posts 51 secured at their lower ends to the channel members I8, the posts passing through bearings 58 formed in each of the four corners of the frame 56 at the bottom and top thereof. At the top of the frame 56, the bearings 58 are connected by front and back parallel frame members 59 and spaced parallel end frame members 68. At the bottom of 'the frame 56, the bearings 58 are connected by front and back parallel frame members 6| and spaced parallel end frame members 62. The upper frame, formed by the frame members 59 and 68 connected to the bearings 58, and the lower frame, formed by the frame members 6| and 62 connected to the lower bearing members 58, are spaced apart by vertical frame members 63.

The four posts 51 are connected at their upper ends by a plate 64 secured to the posts 51 by means of bolts 65. The plate 64 is provided with an overhanging portion 66 extending beyond the pair of posts 51 at the right end of the machine as viewed in Figure 1, for a purpose to be described. The central portion of the plate 64 is cut away as at 61 to provide an opening, for a purpose to be described.

A shaft 68 is journalled at its ends in the front and back frame members 59, and a similar shaft 69 is journalled at its ends in the front and back frame members 6|. A pair of sprocket wheels 18 are mounted on the shafts 68 and 69. An endless link belt 1| passes over the sprocket wheels 18.

A plurality of male mold members, designated generally by the numeral 12, are carried by the link belt 1| for movement therewith. Referring particularly to Figure 6, the male mold members 12 comprise a molding element 13 formed integral with a rectangular plate 14 which is secured by suitable fastening elements 15 to a rectangular plate 16. A ring 11 having its inner face bevelled as. at 18 to conform to the bevel face 25 of each of the female mold members I6, is resiliently secured to each of the plates 14 by screws 19. Coil springs surrounding the screws 19 are arranged between the inner face of the ring 11 and the lower face of the plate 14 to provide for the resilient mounting of the rings 11. As will be apparent, the molding element 13 of each of the 'male mold members 12 is adapted to be received in the central opening of each of the female mold members l6 to provide for the molding of articles of glassware in the molds.

Each of the plates 16 is provided with a pair of ears 8| at each side thereof. The two sets of the pairs of ears 8| are spaced from each other a distance slightly greater than the width of the link belt 1|, which is adapted to be received between the two sets of ears 8| at the sides of each of theplates 16. The ears 8| are provided with openings 82 adjacent the free ends thereof to receive the pins 83 and 84 connecting adjacent links of the link belt 1|. Each of the pins 84 is of slightly enlarged diameter and extends beyond the belt 12' and ear 8| at the front of the machine, for a purpose to be described.

An elongated depending arm 85 is pivotally carried at its upper end by the plate 64 adjacent the forward edge thereof, as shown in Figure 1.

eter of the connecting'pins 84. The inner edge at the lower end of the arm 85 is curved as at 81 to provide a cam face to cause the leveriarm to be swung out of the path of the extended connecting pins 84 during the downward passage of such pins adjacent the lower end of the arm 85 7 upon the counterclockwise movement of'the link.

- on the posts 51 by fluid pressure means. In the embodiment of the invention shown in the accompanying drawings, the frame is reciprocated by means of a pneumatic motor designated generally by the numeral 00. The pneumatic motor comprises a cylinder I closed at its ends by an integral end plate 02 and a detachable end'plate 03. The upper end plate 02 is bolted to the extended portion 5.0 of theplate 84 to rigidly support the motor 00 with respect to the machine. A piston 04 connected to a piston rod 05 .is adapted to reciprocate in the cylinder 0|, the extent of movement in each direction being limited by the stops 08 and 01, which serve to space the faces of the piston from the end plates mg arms I23 and I24.

and I it when the parts are in the position shown in Figures 1 and 7, and to connect the ports I10 and H8 when thevvalve body H2 is moved in a counterclockwise direction. The valve body H2 is also provided with a cut-out portion I2I adapted to connect the ports I" and H0 when the parts are in the position shown in Figure 7,

and to connect the ports '4 and I" when the valve body H2 is moved in a counterclockwise direction from the position shown in Figure '7.

The. valve body H2 is adapted to berotated by means of an actuating mechanism designated generally by the numeral I22. The actuating mechanism l22 comprises a bell crank lever hav- I'he bell crank lever I22 is mountedon the shaft H8 at the point of connection of the arms I23 and I24 and is splined thereto to effect rotation of the shaft II3 upon 02 and 03 at the limits of the movement of the piston 04.

The piston rod 05 of the pneumatic motor 00 is connected to the reciprocating frame 56 through a shock absorber designated generally by the numeral 08.

cured to the frame member 82 at one end of the frame 58. The shock absorber 08 -comprises a cylinder IOI having a closure I02 at its lower end and a threaded cap I08 atits upper end, both of which closures are provided with air vents I04. The closure cap I08 is provided with a central opening to receive the-piston rod 05 of compressed airin accordance with the actuation of a regulator valve, designated generally by the numeral I'08. An air pipe I00 is adapted to deliver air under pressure from the regulator valve I08 into the-cylinder 0I above the piston 04,

'and a pipe I I0 connects the regulator valve I08.

to the interior of the cylinder 0I below the piston 04.

The shock absorber 08 is connected at its lower end to a bracket 00 se-- Referring particularly to Figures 4 and '1, the

regulator valve I88 comprises a fixed valve plate III secured to the outer face of the channel member II at the front of the machine, and a rotatable valve body II2 splined to-a shaft III passing through-the valve plate III and the vertical web of the associated channel member I0. The valve plate I is provided with a port H4 connected to a pipe II5 which, in turn, is connected to a source of compressed air (not shown).

The valve plate III is also provided with a port -I|0 which is connected to the pipe I00 and a port I H which is connected to the pipe III. The valve plate III is also provided with ports H8 and H0 connected to the atmosphere. The rotatable valve body H2 is provided with a cut-out portion I20 adapted to connect the ports II4 friction washer I21.

movement of the bell crank lever I22. The bell crank lever I22 is secured in position on the threaded forward end of the shaft I I0 by means washer I21 is arranged between the nut I20 and 25 thechannel member I0. I

The bell crank lever I22 which serves as the actuating means for the rotatable valve body II2 of the regulator valve I08 is adapted to be swun between the full line and dotted line positions shown in Figure 1 and to be held in either of such positions by the friction provided by the The movement of the bell crank lever is effected by means of the upstanding lug 54 on the crosshead 41. The full line position of the parts shown in Figure 1 shows the bell crank lever H2 in its limit of movement in a clockwise position and the' dotted line position of the parts shown in Figure 1 indicates the limit of movement of the bell crank lever I22 in a counterclockwise direction. With the parts as shown in the full line position, the elements of the regulator valve I08 are in the-position shown in Figure '7.

Referring 'to Figure 1, the lower end of the bell crank lever arm I24 is provided with a pivoted depending link I28 one edge of which is adapted to bear against a stop I20 formed on the extreme end of the lever arm I24. As will be apparent, the link I28 is held against coun-'- terclockwise movement with respect to the lever arm I24 but is free to partake of clockwise movement with respect to the lever arm I24. It will be noted that the depending link I28 is arranged in the path of the lug 54 on the crosshead 41 at a pointintermediate the limits of movement of the crosshead. With the parts in the full line position shown in Figurel, the movement of the crosshead 41 from left to right brings the upstanding lug 54 into contact with the forward edge of the link I28 causing such link to bear against the stop I20 to swing the lever arm.

I24 upwardly to the dotted line position shown. This movement causes the rotation of'the valve body II2 of the regulator valve I08 whereby the the lower end of the link I28 will merely swing the link in a clockwise position to pass under it, after which the link I26 will return to its vertical position. Further movement of the crosshead (I toward the left brings the' lug 51- into contact with the inner edge of the lever arm I23 and causes such arm to be moved from the dotted line position to.the full line position shown in Figure 1. This movement restores the elements of the regulator valve I08 to the positions shown in Figure 7.

The operation of the machine is as follows:

In the production of pressed glassware,a regulated amount of molten glass is delivered through the spout 55 to one of the female mold members I6, which, at the time of delivery of the supply of molten glass thereto, is stationary at a point below the mouth of the spout 55. Thereafter, the female mold member containing its supply of molten glass is advanced in the direction of the arrow in Figure 1 to a position midway between the upright posts 51 where it is automatically stopped. At this point one of the male mold members 12 is brought downwardly to mold an article of glassware of predetermined shape between the complementary mold members. The male mold member is then automatically withdrawn by movement upwardly and the female mold member is moved away from its position in the direction of the arrow and another female mold member containing a supply of molten glass is brought into the position centrally of the upright post 51 and another male mold member is moved downwardly into molding position, this sequence of operations continuing during the operation of the machine. During the passage of the female mold members I6 along the upper run of the link belt I2, the-hinged sections of the female mold members are held together by means of the rails 36. However, as soon as a mold member I6 has moved past the outer limit of the .rails 34, the hinged sections of the mold members may be swung apart to permit the withdrawal of the pressed article of glassware.

As will be apparent, the female mold members I6 carried by the link belt I2 are moved in the manner described ina step by step movement, a sufficient interval between successive steps of movement being provided to allow the molding operation to be completed and the male member to be withdrawn from the female member before the next step of movement occurs. This movement is effected in the manner described below. When the frame 56 is in its upward-position, as shown in Figures 2 and 3, the crossheads 41 will be in the dotted line position shown in Figure 1, the link belt I2 and the female mold member I6 carried thereby being stationary. 'The depending levers I- carried by the crossheads 41 will then be in near engagement with the opposite end portions of one of the extended pins 30, as indicated in Figure l. The further rotation of the crank wheel 31 by means of the drive chain 40 causes the connecting rods 45 and the toward the right, as viewed in Figure 1. Due to the fact that the depending levers 5I are free to swing in a clockwise direction, the lower ends of the levers 5I pass over the extended portions of the pin 30 which the depending levers contact during the movement of the crossheads 41 from left to right and, at the limit of movement of the crossheads, assume the position indicated by the dotted-lines in Figure 1. Further rotation of the crank wheel 31 advances the link belt another step forward in the manner described above.

When the parts are in the dotted line position shown in Figure l, the link belt I2 is stationary with one of the female mold members I6 in a position to receive one of the male mold members I2. Under the conditions described, the frame member 56 is in its upper position with one of the crossheads 41 to be moved toward the left toward the full line position shown inFigure 1. Due to the fact that the stops 53 prevent movement of the depending levers 5I in a counterclockwise direction, as viewed in Figure l, the movement of the depending levers 5I toward the left causes the link belt I2 to be moved in the direction of the arrows in Figure 1 until the crossheads have reached their limit of movement toward the left, thereby advancing the link belt I2 a distance equal to the distance between adjacent connecting pins 30. Further rotation of the crank wheels 31 causes the crossheads 41 to be moved male members I2 located directly above one of the female mold members I6. Under the condition specified, the bell crank lever I22 associated with the regulator valve I08 will be in the dotted line position shown in Figure 1. In this position, the elements of the valve I08 serve to connect the upper end of the cylinder 9| of the pneumatic motor 90 to the atmosphere and the lower end of the cylinder 0] to air under pressure,.which serves to hold the piston 94 in its upper position indicated by dotted lines in Figure l. The frame 56 is thus held in its upper position. As the crossheads 41 are moved toward the left, the upstanding lug 54 on the crosshead 41 at the front of the machine comes in contact with the lower end of the arm I23 of the bell crank lever I22 and moves the arm I23 from the dotted line position to the full line position shown in Figure 1. This rotates the body II2 of the valve I08 in a clockwise direction to bring the valve elements into the position shown in Figure 7. In this position the ports H4 and H6 are bridged by the cut-out portion I20'and air under pressure is delivered from the supply pipe I I5 to the pipe I09 connected to the upper end of the cylinder 9|, thereby admitting air under pressure on the top of the piston 94. At the same time, the port I" is connected to the atmospheric port II9 by means of the cut-out portion I 2| of the valve element II2, thereby connecting the lower end of the cylinder 9I' to the atmosphere. As a result of these connections, the piston 94 is forced downwardly by compressed air in the cylinder SI. As soon as the piston 94 starts to move downwardly, the frame 56 moves downwardly under the force of gravity until the ring ll of one of the male mold members I2 comes in contact with the upper edge of one of the female mold members- I6. Further movement of the piston 94 serves to compress a spring I01 of the shock absorber 98. After substantial compression of the spring II, the downward movement of the piston 94 serves to resiliently force the frame 56 downwardly to a further extent. After the ring 71 contacts with the upper end of the female mold member I6, further downward movement of the frame 56 serves to compress the springs between the ring 11 and the plate I4. In this manner, the male mold member 13 is resiliently urged into molding position with the core of the female mold member I6. As will be apparent, the bevelled inner edge of the ring 'I'I bearing against the bevelled upper edge of the female mold member I6 serves to center the male mold member 73 in the female mold member I6 and also functions While the molding operation is taking place in the manner described above, the crossheads 41 are being moved from. the full line position shown in Figure 1 toward the right, the speed of rotation of the crank wheel 3! being regulated toallow for the downward-movement of the frame 59 and the completion of the molding operation before the upstanding lug 54 carried by .the crosshead 41' at the front of the machine lever arm I24 upwardly, bringing the bell crank.

lever I22 in the dotted line position shown in Figure 1, .following which the lug 54 continues to move toward the right for a purpose to be described. l

when the bell crank lever I22 is rotated in a counterclockwise direction in the manner described above, the movable element II2 of the regulator valve I09 is rotated to connect the pipe IIO to the compressed air supply pipe H9 and 5 ment of the frame 59 causes the pin 84 to bear against the lower end of the arm 85 to cause the link belt II to be moved with respect to the frame 56. The frame 96 is adapted to bemoved upwardly, after-contact ofthe pin 84 with the lower end of the arm 85,-a distance equal to the distance between the centers of the adjacent female mold members I2. Thus, when the frame 99 has reached its upper limit of movement, one of the male mold members I2 has been moved from .the molding position below the shaft 89 .toward the right, as viewed in Figure 1, and the 1 next following mold member I2 has been moved to connect the pipe I09 to the atmosphere through the port I I9, the cut-out portion I20 and the port II9. .As a result of these connections, the upper end-of the cylinder 9I is connected to the atmosphere and air under pressure is admitted to the lower end of'the cylinder 9I below the piston 94, which serves to move the piston 94 upwardly. The first increment of movement of the piston 94 serves to compress the spring I08 between the cap I03 and the head I05 oarried by the lower end of-the piston rod 95 for to a position below'the shaft 69, this sequence of operation continuing during the operation of the machine. As a result, each of the male mold members I3 is permitted to cool down to atmospheric temperature before it again functions in the molding operation.

After the frame 99 has reached its upper limit of movement and the link belt II has been moved in the manner described above, the parts are in a position for the frame "to be moved downwardly for a successive molding operation. At this point, the upstanding lug 54 has been moved by the front crosshead 41 to a position in contact with the arm I23 of the bell crank lever I22, and further movement of the front crosshead 4! toward the left moves the arm I23 from the dotted line position to the full line position shown inFlgure 1, as a consequence of which the frame 56 is again moved downwardly by the pneumatic motor 90 in'the manner described above.

1 While I have described in detail the preferred embodiment oflmy invention it is to be understood that the shape, size, and arrangement of a parts may be variously modified without departthe purpose of starting the upward movementof the frame 59 without shock. Further 'upward' movement of the piston 94 causes the upward movement of the frame 50 to move the male member 12 away from the female member I9;

The movement of the frame upwardly continues until the piston 94 reaches the dotted line positlon shown in Figure 1.

As pointed out above, the lower end of; the lever arm I24 associated with a regulator valve I09 is arranged at a point intermediate the limits of movement of the upstanding lug 54 carried by the front crosshead 41. The purpose of this is to provide for the actuation of the bell crank lever I22 to move the frame 96 upwardly before the front crosshead 41 has beenmoved to its limit of movement toward the right to bring the depending levers 9| into driving contact with the extended ends of one of the pins 30. The purpose of this is to provide for the upward movement of the frame 59 to a suiiicient extent to cause the male mold member 19 to clear the top of the female mold member l9 before the link belt I2 is operated to move the latter.

As described above, the lower end of the arm 95 lies in the path of the forwardly extending portions of the connecting pins 94 of the link belt 'II However, when the frame 56 is in its lowermost position, as shown in Figure *1, the lower end of the arm 05 is spaced from the pin 84 next below it a distance at least equal to the distance from the top of one of the female mold members I9 to the bottom of the malemold member I3. As a result, the frame 59 may be moved upwardly a sufficient distance for the lower end of the male mold member I9 to clear the upper end of the female mold member I6 before the -pin' ing from the spirit of the invention or the scope I "of the subioined claims.

I claim: 1. A molding machine comprising a. pair of conveyors, a plurality of mold members carried by one of said conveyors, a plurality of two- 94 comes into contact with theinner edge of the groove 06. However, further upward movepart moldmembers carried by the other conveyor, stationary means between and in engagement with which said last named mold members move during a portion of their travel to be maintained in closed position, means for effecting relative movement of said conveyors toward and away from each other, means for effecting step by step movement of each of said conveyors during the relative movement thereof away from each other, and means operating coincidentally with-the means for effecting step by step movement of one of said conveyors for rendering operative the said means for effecting relative movement of said conveyors toward and away from each other.

2. A molding machine comprising a pair of conveyors, a plurality of mold members carried by one of said conveyors, a plurality of two-part mold members carried by the other conveyor,

stationary means between and in engagementing the relative movement-thereof away from each other, and means operating coincidentally with the means for effecting step by step movement of one of said conveyors for rendering said pneumatic .means operative.

3. A molding machine comprising a conveyor,

a two-part mold member carried thereby, a reciprocable complementary mold member adapted to be moved into and out of molding relationship with said first named mold member, means for reciprocating said reciprocable moldmember, means for moving said conveyor to bring said first named mold member into and out of registration with said second named mold member, and stationary means between and in engagement with which said two-part mold member moves into and out of registration with said second named mold member to be maintained in closed position.

4. A molding machine comprising a onveyor having a plurality of two-part mold embers carried thereby and adapted to partake of a step by step movement to successively bring said mold members into a predetermined position, a reciprocable complementary mold member adapted to be moved into and out of molding relationship with one of said first named mold members when the latter is in saidpredetermined position, stationary means between-and in'engagement with which each two-part mold member travels to and past said reciprocable mold member to be maintained in closed position, means for eifecting reciprocation of said reciprocable mold member, control means for rendering said last named means operative, and common means for causing actuation of said control means and for effecting the said step by step movement of said conveyor.

5. A molding machine comprising a support having a two-part mold member carried thereby and movable from a mold-charging position into a molding position, a reciprocable complementary mold member adapted to be moved into and out of molding relationship with respect to said first named mold member when the latter is in molding position, stationary means between 'and in engagement with which said two-part mold member moves into and out of registration with said second named mold member to be maintained in'closed position, means for reciprocating said-reciprocable mold member, control mechanism for said last named means, and com.- mon means for causing actuation of said control mechanism and for effecting the said movement of said support.

6. A molding machine comprising an endless conveyor, a plurality of two-part mold members carried thereby, driving mechanism including means for effective step by step movement of ried by said last named conveyor, means for moving said second named conveyor toward and away from said first named conveyor, control I means for rendering said last named means operative, means operated by said driving mechanism for actuating said control means, and automatic means operable upon the upward movement of the second named conveyor to move one of the complementary mold members carried thereby into registration with one of said first named mold members when the latter is in said predetermined position.

7. A molding machine comprising a pair of endless conveyors, a plurality of mold members carried by one of said conveyors, a plurality of two-part mold members carried by the other conveyor, each of said conveyors being movable in a step by step movement to bring a mold member on one of said conveyors into registration with a mold member on the other conveyor, stationary means between and in engagement with which each two-part mold member travels to and past its position in registration with one of said first named mold members to be maintained in closed position, means for bodily moving one of said conveyors toward and away from the other of said conveyors to move the mold members which are in registration into and out of molding relationship, and common means for effecting the step by step movement of one of said conveyors and for rendering effective the said means for moving the other conveyor toward and away from the first named conveyor.

8. A glass molding machine comprising a horizontal frame, a pair of sprockets mounted in said frame, an endless conveyor passing around said sprockets and supported thereby, a plurality of two-part mold members carried by said conveyor, a second frame supported for reciprocation above said conveyor, an endless conveyor carried by said second frame, a plurality of complementary mold members carried by said second named conveyor, driving mechanism including'means for moving said first named conveyor in a step by step movement to successively bring the mold members carried thereby into a predetermined position and arrest the movement of the same in such position, stationary means between and in engagement with which each two-part mold member travels to and past said predetermined position to be maintained in closed position, a fluid motor for raising and lowering said reciprocable frame, a valve for delivering fluid under pressure to said fluid motor, valve actuating mechanism operated by said driving mechanism, and automatic means operable on the upward movement of said second frame to impart step by step movement to the conveyor carried thereby.

THOMAS H. JEFFERS 

